[issue2506] Add mechanism to disable optimizations

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Note that disabling bytecode optimizations will not help to solve other problems with the coverity tool in 3.8: issue34705 and issue34876.

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<https://bugs.python.org/issue2506>
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